A363856 - OEIS

A363856

Number of divisors of 7*n-4 of form 7*k+6.

0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 2, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 2, 0, 0, 0, 2, 0, 2, 0, 1, 0, 0, 0, 2, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 3, 0, 1, 0, 1, 0, 1, 0, 2, 0, 0, 0, 2, 1, 0, 0, 1, 0, 2, 0, 2, 1, 0, 0, 3, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 3, 0, 0, 0, 2, 0, 1, 0, 1, 1, 1, 1, 2

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OFFSET

1,16

COMMENTS

Also number of divisors of 7*n-4 of form 7*k+4.

LINKS

Table of n, a(n) for n=1..100.

FORMULA

a(n) = A363806(7*n-4) = A363808(7*n-4).

G.f.: Sum_{k>0} x^(4*k)/(1 - x^(7*k-1)).

G.f.: Sum_{k>0} x^(6*k-2)/(1 - x^(7*k-3)).

MATHEMATICA